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Arfan, A., & Rukiah, M. (2015). Crystal structures of crotonaldehyde semicarbazone and crotonaldehyde thiosemicarbazone from X-ray powder diffraction data. Acta Crystallographica Section E Crystallographic Communications, 71(2), 168–172. doi:10.1107/s2056989015000663 
10.1107/S2056989015000663